NAUI Instructor EXAM UPDATED ACTUAL Questions and
CORRECT Answers
Henry's Law The amount of gas dissolved in a liquid is directly related to its partial pressure
above the liquid.
Relationship of gas solubility and temperature Solubility of gas decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue Body tissue absorbs more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables Gives the diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule Use the next greater dive TIME to determine letter group
Equilibrium as it relates to nitrogen in the body When the pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio Originally 2:1 - Updated with new research to 1.58:1
Tissue compartment half-time The time required for the compartment to absorb or eliminate half of the pressure
difference between what it started with and the ambient pressure
M-Value of tissue The maximum allowable nitrogen (inert gas) pressure in a specific tissue
, NAUI recommendation for diving while pregnant Do not dive while pregnant
Haldane tissue compartments Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment Mathematical model consisting of multiple theoretical tissues and their relative
halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude Slower than at sea level
Extend dive times with gas by Decreased nitrogen and increased oxygen in breathing gas
RNT Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops Remain out of the water, rest, breathe 100% oxygen, drink fluids, be monitored for
signs of decompression illness, transported to a hyperbaric facility if symptoms
arise
SIT Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Based on 20+ years of research pioneered by Kidd and Stubbs (1962)
Institute of Environmental Medicine (DCIEM)
Swiss Dive Tables Developed by A.A. Bühlmann at the University of Zurich - EXTENDED TO
INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw Use the Maximum Dive Time as your Total Dive Time
(15 fsw) causes your Total Dive Time to exceed the Dive
Time Limits, you should:
Aching pains an hour after a dive might be: Decompression sickness
ATA rating for most hyperbaric chambers for treating 6 ATA
divers:
Haldane Tissue Half-Times (Compartments) 5, 10, 20, 40, 75 Mins
High altitude dive Any dive at greater than 1000 feet
CORRECT Answers
Henry's Law The amount of gas dissolved in a liquid is directly related to its partial pressure
above the liquid.
Relationship of gas solubility and temperature Solubility of gas decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue Body tissue absorbs more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables Gives the diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule Use the next greater dive TIME to determine letter group
Equilibrium as it relates to nitrogen in the body When the pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio Originally 2:1 - Updated with new research to 1.58:1
Tissue compartment half-time The time required for the compartment to absorb or eliminate half of the pressure
difference between what it started with and the ambient pressure
M-Value of tissue The maximum allowable nitrogen (inert gas) pressure in a specific tissue
, NAUI recommendation for diving while pregnant Do not dive while pregnant
Haldane tissue compartments Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment Mathematical model consisting of multiple theoretical tissues and their relative
halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude Slower than at sea level
Extend dive times with gas by Decreased nitrogen and increased oxygen in breathing gas
RNT Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops Remain out of the water, rest, breathe 100% oxygen, drink fluids, be monitored for
signs of decompression illness, transported to a hyperbaric facility if symptoms
arise
SIT Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Based on 20+ years of research pioneered by Kidd and Stubbs (1962)
Institute of Environmental Medicine (DCIEM)
Swiss Dive Tables Developed by A.A. Bühlmann at the University of Zurich - EXTENDED TO
INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw Use the Maximum Dive Time as your Total Dive Time
(15 fsw) causes your Total Dive Time to exceed the Dive
Time Limits, you should:
Aching pains an hour after a dive might be: Decompression sickness
ATA rating for most hyperbaric chambers for treating 6 ATA
divers:
Haldane Tissue Half-Times (Compartments) 5, 10, 20, 40, 75 Mins
High altitude dive Any dive at greater than 1000 feet
